PDF malware analysis — malicious · 493c55da3e992788

MALICIOUS

PDF

1.6 KB

MD5: e5a91bbd62f507bf01b4ee40e0b836d8 SHA-1: b6117fe1b6b1316ab89086a328192a5560a1bafb SHA-256: 493c55da3e9927884f9a7e286deda1c228000c7f25cc7051ab1c358405b30490

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The JavaScript stream, identified as 'javascript_obj0005_000.js', is likely responsible for executing the malicious payload. The use of unescape() and String.fromCharCode suggests obfuscation techniques within the script.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `e01ab2d347d4ab915edf36748dd1221310fbc4c699bd8b389e3d75cd65962939`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	5500 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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